"Proton isn’t foolproof or bulletproof.
With a dedicated Linux version, there is no guesswork about which Proton version to use. No unintentional breakage. The developer is in full control of ensuring gamers have the best experience possible. And with Linux gaming on the rise, this is a good look for game developers to have."
https://www.forbes.com/sites/jasonevangelho/2024/12/21/will-civ-7-run-on-steam-deck-and-linux/